Filter plates are used to saturate soil samples within the sampling rings. A filter paper is inserted into the filter plate. Then the soil sample ring filled with soil is inserted with the cutting edge first into the sieve bottom. The Hartge hood permeameter, amongst others, can be used for the saturation process. The inner filter plate ensures optimal hydraulic contact between the drilling holes on the bottom of the sieve and the surrounding water bath. The filter plates are part of the ku-pF multi place as well as the single place.